Symptom: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 963 at kernel/kthread.c:1430 kthread_destroy_worker+0x84/0x98 ... vdec 30210000.video-codec: Runtime PM usage count underflow!
Root cause: The driver calls pm_runtime_put_sync() unconditionally in remove, but the device may already be suspended due to autosuspend (5 second delay configured in probe). When autosuspend has already suspended the device, the usage count is 0, and pm_runtime_put_sync() decrements it to -1, causing the underflow warning. Fix: Replace pm_runtime_put_sync() with pm_runtime_dont_use_autosuspend() which properly pairs with pm_runtime_use_autosuspend() from probe. This allows pm_runtime_disable() to handle reference count cleanup correctly regardless of current suspend state. The disable function internally handles the usage count properly without causing underflow. Signed-off-by: Xulin Sun <[email protected]> --- drivers/media/platform/chips-media/wave5/wave5-vpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu.c b/drivers/media/platform/chips-media/wave5/wave5-vpu.c index efec4ed97c83..61f0b5468ac3 100644 --- a/drivers/media/platform/chips-media/wave5/wave5-vpu.c +++ b/drivers/media/platform/chips-media/wave5/wave5-vpu.c @@ -360,7 +360,7 @@ static void wave5_vpu_remove(struct platform_device *pdev) hrtimer_cancel(&dev->hrtimer); } - pm_runtime_put_sync(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_disable(&pdev->dev); mutex_destroy(&dev->dev_lock); -- 2.49.1
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